I see - if you need a perfect match of Rhino render and Max render, there are more factors than just camera/target positions and lens length, since Rhino output depends on your monitor resolution aspect ratio and your image ratio. The tested configuration that will work for sure (but is a bit crazy, I know) is: Make sure your screen resolution is set to 3:2 (like 1600x1200 or so) and your renderings/screenshots are done in 1.5:1 ratio (i.e. 3600x2400 pix, 3000x2000 pix. etc.). Then you should get a perfect overlay match, if that’s what you need, and not just general camera angle match.
hth
–jarek