Hmmm...

Page 131 of the data sheet:

http://www.rennes.supelec.fr/ren/fi/...ocs/16f62x.pdf

Seems to say that the disaprity is ok. The voltage on the MCLR pin can range from Vss-0.3 to Vss+14. So pulling it to 5v should not be a problem, even if the rest of the PIC is running of 3v3

ben