It’s best to check these things. Pulp’s format calls for a panel height of 1.700", which is the correct size to fit (with the customary 0.050" clearance) in a 1RU space. His format also calls for the use of Vector-style rails, which results in 1.170" clearance between the rails–and he tends to use nearly all of that for his PCBs, I discussed it with him.
Intellijel’s 1U format, by contrast, uses “lipped” rails which are also thicker. The clearance between rails is considerably less than with Pulp’s format; panel height is slightly less. Repaneled Intellijel tiles would likely fit in Pulp rails but not vice versa. (Intellijel’s site update omitted the mechanical specification page, so no link …)
Don’t forget that the power connectors are different between the two formats.