pdflatex: pdf not inserting properly when page sizes are different

I have to insert pdfpages of differnt sizes(heights) whose page sizes i know. I am trying

batchmode
documentclass{article}
usepackage{pdfpages}

begin{document}
eject pdfpagewidth=432pt pdfpageheight=506.52pt
includepdfmerge[]{/home/simha/latex/test.pdf, 1}
eject pdfpagewidth=432pt pdfpageheight=116.27999999999997pt
includepdfmerge[]{/home/simha/latex/test.pdf, 2}
end{document}

What i am getting is

instead of