How many frets does the neck have? If its a 30” neck then it’s likely to have 21 frets if it’s not a conversion neck, and 22 if it is. There will only be about 1/2” / 12-13mm difference in the neck length between the two types, but with a TOM style bridge, you won’t have enough adjustment available with a non-conversion neck unless you plug the post holes and redrill them the right amount further from the neck. So its worth putting some masking tape between the post holes, drawing a line between the hole centres, then drawing a line parallel to that about 2mm further forwards. Then put the neck in the pocket and measure 30” along the neck from the high ‘B’ (high E slot on a standard guitar) parallel to the edge of the neck, to where it meets that forward line (TOM saddle forward position). You need to measure along the path of the string.

The thicker baritone strings will intonate a bit further back from the nominal scale length than with standard guitar strings, so the top/high B will probably intonate about 1 to 1.5mm back from the 30” (762mm) scale length.

So 763 mm coming anywhere between the two lines and you’re fine. Very slightly out and you’ll probably be fine, but if you have a significant discrepancy you’ll have issues.