Sure, they are similar--both bound with eggs, custard, no? I have made pressure flan. . .
and it is VERY simple and VERY delicious. Hardest thing is to make the caramel!
As for a pressure cooked cheese cake, as mentioned above, you cook in a separate, foil-sealed pan (or not seale, as you wish). I have not done a pressure cooked cheesecake, but I just might have to try it soon. Looks pretty simple.
My favorite cheesecake is one by Rose Levy Beranbaum, from her " Cake Bible" cookbook. It is cooked without a crust, in a water bath and it is, I think, fabulously tasty.