Having said that, although I don't own any 341 or 325 lasted boots, I did just try on the Coniston (325) and Harlech (341) in the same size, 7E UK (I'm 8d tts in US). I found the standard dark brown shell Harlechs in 7E to fit me perfectly whereas the 7E Conistons might have been a tad bit wide enough for me to drop a 1/2 size down.
If a 325 lasted boot is snug, I'd be concerned that a 341 lasted boot in the same size might be a problem. But again, that's me. YMMV.