i would be very careful about doing this, is your surface a pro 3 model? reason i say is because at some point, they switched from wacom digitizers to n-trig (and eventually bought n-trig if im not mistaken) so if you're switching from a digitizer that is wacom to n-trig you might have problems.
however, if you're certain that you're digitizer is an n-trig and the replacement is an n-trig just an updated model (or vice versa for wacom) it may be worth the risk, depending on whether there is any reward/benefit.
if not, i wouldnt bother and just replace it with an OEM digitizer that your device shipped with.