The most important question is: does your application support both 32bit and 64bit? e.g. Modern oracle only supports 64bit, which *requires* 64bit perl. If however you are depending on old9er) shared libs that are only available in 32bit, you'd have to stick to 32bit perl.

And TEST before you go live.

Side note, when moving, why not move to a more modern perl too? You'd have to test anyway. The most recent stable release is 5.14.2 (but I do not know what your distribution can offer).