It's good you asked, because your feeling is wrong.
The Moto 120e is a dual-band CDMA phone, and is doubtless locked to work only on Verizon. The Samsung is a GSM phone that is locked to ATTWS. To work on any other network, they'd need to be unlocked. If you still have service with the carriers, you could try calling them or going to one of their stores and ask nicely if they'll unlock them, but don't be surprised if they say no.
If you could unlock them, a big if, the CDMA phone would work with other CDMA 800/1900 carriers, many of of the second tier telco-related ones like Alltel. The GSM phone would work on other GSM networks, which in the US basically means Cingular (the part that didn't used to be ATTWS) and T-Mobile.
I'd suggest selling them as locked phones and making it clear that they're for Verizon and ATTWS.
R's,
John