GENERALLY SPEAKING...
Today, irrigation control valves are all pretty much controlled the same way... the controller just needs to supply (about) 28v AC to the control valve.
To know FOR SURE, what you would need to do is deterime what irrigation valves you are using, get their (electrical) specifications and compare them to the (electrical) specifications of what the desired controller can generate.
As for the controllers... if you like the "Signature (Nelson) Controllers" you have (in some areas), then why are you asking what Nelson controller is comparable to the Hunter SVC 100 if you dislike the SVC 100 so much that you want to replace them. Shouldn't you instead be asking what Nelson has that is most like the other controllers (assuming you can't get the exact model number of the Nelson's you already have).