Video Card Replacement Question

I need to replace the video card in my iMac. I've taken it apart and removed the graphics card. My question is, do I need to have an exact duplicate of this card in order for the iMac to take it or is there a little wiggle room for card precision.

For example, a label on my card reads "CC3A" on one line and "3PPIBMA0070" on another. I've found a video card that reads "CC3B" and "3PPIBMA0080". Will my iMac take this card or will it only want an exact replacement?