How can I plot 2 figures around a node using tkz-collection in a single tikz picture?

Question

Usually I can specify a node location relative to location of another node, e.g., using left of and alike

\usepackage{tikz}
\usetikzlibrary{positioning}
...
\matrix (first) [left of=arrow, matrix of math nodes, ampersand replacement=\&,
  left delimiter=\|, right delimiter=\|, xshift=-2.5cm] {
...

Now I want to plot two simple figures using tkz-collection separated by a node with text vs. However I want to show same domain, i.e., I want to have same coordinates in \tkzInit. I thought I can isolate coordinates conflict using scope but it does not look like the case.

Is the coordinate space defined by \tkzInit global for entire tikzpicture? Shall I use overlay to somehow combine 2 figures?

Here is what I've tried

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usepackage{tkz-fct}

\begin{document}

\begin{tikzpicture}
\begin{scope}
\tkzInit[xmin=-3,xmax=3,xstep=2, ymin=-3,ymax=3,ystep=2]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node (a) at (3,0) {hello};
\end{scope}

\begin{scope}
\tkzInit[xmin=-3,xmax=3,xstep=2, ymin=-3,ymax=3,ystep=2]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node[right=5cm of a] (b) at (3,0) {hello};
\end{scope}

\end{tikzpicture}

\end{document}

I see 2 separated *hello*s but only a single figure.

Answer 1

As mentioned in the comments, use \xshift option on the second scope environment. As commented by Qrrbrbirlbel, you can also remove the at (x,y) specification. Also, I have cleaned up the preamble a bit. tkz-fct automatically loads tikz

\documentclass{article}

\usepackage{tkz-fct}
\usetikzlibrary{positioning}


\begin{document}

\begin{tikzpicture}
\begin{scope}
\tkzInit[xmin=-3,xmax=3,xstep=2, ymin=-3,ymax=3,ystep=2]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node (a) at (3,0) {hello};
\end{scope}

\begin{scope}[xshift=5cm]
\tkzInit[xmin=-3,xmax=3,xstep=2, ymin=-3,ymax=3,ystep=2]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node (b) at (3,0) {hello};
\tkzText[above,color=red](3,0){hello}
\end{scope}
\end{tikzpicture}

\end{document}

You can see the definition of \tkzInit in \tkz-tools-base.tex. I can't understand most of it though. :)

Also the use of \xshift and coordinate transformations in general are explained in page 250 of the pgf manual. It says that any specified coordinate is first "reduced" to a position of the form "x points to the right and y points upwards." ... The next step is to apply the current coordinate transformation matrix to the coordinate." This means that for the second scope, each original x coordinate is transformed.

Update The tkz collection has a command for placing text: \tkzText. I have modified the code with tkzText on the second scope just for comparison.

Edit I can finally say that it is not a bug. The behavior was caused by the xstep and ystep options. Here is the revised MWE. I did not delete the previous one for comparison.

\documentclass{article}

\usepackage{tkz-fct}

\begin{document}

\begin{tikzpicture}
\begin{scope}
\tkzInit[xmin=-3,xmax=3,xstep=1, ymin=-3,ymax=3,ystep=1]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node (a) at (3,0) {hello};
\end{scope}

\begin{scope}[xshift=8cm]
\tkzInit[xmin=-3,xmax=3,xstep=1, ymin=-3,ymax=3,ystep=1]
\tkzGrid[sub,subxstep=1,subystep=1](-2,-2)(2,2)
\tkzAxeXY
\node (b) at (3,0) {hello};
\tkzText[above,color=red](3,0){hello}
\end{scope}
\end{tikzpicture}

\end{document}