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Sorry for the delay in replying. It has to be fairly close shape I guess but ultimately, if slightly different doesn't matter too much. Long as spec is same.
I'm only changing to see if it fixes a problem with a automotive pcb board I have that has failed. I have changes several other parts and though this could be the issue. for a couple of pounds worth replacing it.
I read that time and tempture effects these, and this automotive part lives inside the engine bay and get hot.
Crystals do occasionally fail, but it's really pretty rare - is the board not doing anything?, which is what you would expect if the crystal has stopped oscillating (the processor won't run) - drifting off tune slightly, probably wouldn't have any major effect, or any at all?.