I'm thinking that you shouldnt have a problem, since they're both WM6. You can also do the same via dashwire,
www.dashwire.com. This is a cloud based backup that will take care of not only your contacts, but SMS, pIE faves, voicemail, and pix. If PIM Backup is anything like SPB B/u (which I use), you should be able to put your SD card containing the b/u file in your new device and run it from there and you'll be back in biz.