I can see by eye that the 400/360 WR has less shoulder than the 400-350NE cartridge I have here & measurements seem to confirm that !

WR 360 is neck 0.384 shoulder 0.419 so 0.035
400-350NE is neck 0.379 shoulder 0.0416.5 so 0.0375

WR 400/360 is NL 0.579 & OAL is 2.745

400-350 is NL 0.545 & OAL is 2.740

Bit hard to measure neck length on these buggers !