HTC Desire :: Phone / Google Shows Contects Different

I'm a bit concerned my phone is reporting 775 goggle contacts, but goggle says 639. I am about to delete all contacts off my phone and tidy up the ones on goggle by merging duplicates, and then re-import from goggle to my phone... but am reluctant to do this while the phone says i have more goggle contacts that goggle does I have synced a couple times but still the numbers don't match. I have checked and goggle still has not merged contacts so that isn't the reason for the difference either.