I sometimes wonder if when folks are expressing views so adamantly they have ever actually owned and compared both guitar types personally. In this instance, I do and have.
The first guitar is a hand-built set neck Philtone J-caster with cocobolo top and back, the second a Warmoth J-caster bolt-on with a Malagasy rosewood top. Both guitars have a UGB, OBEL, brass nut, brass bridge, brass stoptail, middle Dimarzio Super 2, and other commonalities as well as differences. Do they sound identical? No. Could you record the difference? Maybe. Could you hear it at a gig? Perhaps if your hearing is more acute than mine.
Some people agonize over that last 5%. Others are satisfied with and enjoy the 95%. This is not a moral judgment, just an observation (there are things in life where the last 5% is important to me, too, though not here). If you, like me, are in the latter category, I predict you'll be happy with a Warmoth J-caster if that's what your budget allows for but you'll have to keep an open mind and place feel and tone over cosmetics and expectations.
"For me, I think the only danger is being too much in love with guitar playing. The music is the most important thing, and the guitar is only the instrument." Jerry Garcia