Switching LTE phones on Verizon

Quick question,

I have a Galaxy S4 on Verizon, but it's a work phone and I'd much rather have the HTC One M8. If i buy the M8 and swapped SIM cards with the GS4, would it work? I know this wasn't possible before Verizon switched to LTE, is it possible now? Would I have to contact Verizon at all?