Not all pacemakers are built the same though either, right?
Dunno, have limited experience on them.
If you're not sure about your valve and it's compatibility, you should be able to AT LEAST contact the hospital where your surgery was performed and ask about it, if not contacting your surgeon directly or, as was stated above, having an identification card that goes along wiht your spiffy new valve.
I've got a St. Jude's too, plus the card which I carry with me all the time in my wallet. I've gathered from reading in here that not everyone has one of those cards. It's not just a SJM thing, I believe every manufacturer in the US is required to hand them out to valve recipients, though I'm not sure on that....
In any case, you should be able to contact the hospital where you got yoru valve and ask them for the particulars.