they're "sorta" interchangable in that they use the same barrel size, tang, and wedge location in the stock. BUT the fore-ends are different lengths so one way there's about an inch gap between underrib and fore-end. the other way the rib is about an inch or so too long but not sure which way is which. also, as the seneca is the more expensive of the two so i don't really see that as bein' a solution and as mentioned ya could buy a renegade or hawken for what you'd pay for a barrel. my opinion and yer welcome to it, bubba.