As far as what Warmoth currently offers, correct. However,
Jackson, Kramer, et al don't add a fretboard shelf like Warmoth does to accommodate 24 frets. Instead, they lengthen the neck and extend the neck heel accordingly. To confirm, I measured my Kramer Striker (early Gibson era) and my Strat. Both are 25.5" scale guitars but the distance from the nut to the end of the neck pocket is approximately 15 and 5/8" on the Strat and approximately 16 and 3/8 on the Striker. 3/4 of an inch may not seem like much unless you want to use what a 24 fret neck offers and if the guitar is not a neck through, that chunky bolt-on neck-body union gets in the way.
Street Avenger said:
There is no difference in neck heel location for 24 frets on any 25-1/2" scale guitar. The fretboard is just extended and overhangs the body.