Yes, I know for a fact that Lost Planet's mascot mecha is PTX-40A Ivan; yet, with that said, I notice that in Namco Bandai's Super Robot Wars, its OG mecha has the same PTX- designation.

Here's a list of them:

PTX-003C    Alt Eisen
srwog.velv.net/sprites/og2/alteisen6.gif

PTX-004      Schutzwald
srw-shrine.tripod.com/sitebuildercontent...

PTX-005      Wildschwein
srw-shrine.tripod.com/sitebuildercontent...

PTX-006      Wildraubtier
srw-shrine.tripod.com/sitebuildercontent...

PTX-007-3C Weiss Ritter
srw-shrine.tripod.com/sitebuildercontent...

PTX-014      R-Blade
srwog.velv.net/sprites/og2/arblade4.gif

PTX-015      Wild Wuerger
srwog.velv.net/sprites/og2/wuerger02.gif

PTX-016      Wild Falken
srwog.velv.net/sprites/og2/falken4.gif

Also, the fact that Lost Planet was released in 2007, while SRW is an ongoing franchise since 1991 and already included Tatsunoko, Takara Tomy, SEGA (to name a few) as licensed characters.

With these said, I hope it's a foreshadowing for a future crossover project.