Well, originally, I would have had an easy answer based on the UWFi Snake Pit products as opposed to the UWF/PWFG products. Billy Robinson, a British catch-wrestler, ran the UWF Snake Pit, where the likes of Sakuraba, Tamura, Kanehara and Takada trained at one point and where the Abe Ani Combat Club people sometimes train as well as Manabu Inoue and of course, Barnett.
However, although I was one of the people who might have helped popularize the "Robinson taught the UWFi guys including Sakuraba catch" perception, I think that Lou Thesz, amongst others, was way more involved than given credited for. Watch his matches; as I said earlier in the thread, he's the one, more than Robinson or Gotch, that has stylistic similarities to the UWFi guys. And Takada WAS trained by him, and Takada was the face of the UWFi. So it only makes sense that he would have impacted guys like Takada's good friend Sakuraba and the other UWFi'ers, if any old-school catch guy did.
There's a general stylistic distinction to be made between the UWFi-Kingdom guys and the early Pancrase guys, absolutely. The UWFi'ers generally make great use of the rolling DWL/kimura and of standing to upper-body submission transitions and traditional wrestling takedowns over the standing to leg-attack transition emphasis in many early Pancrase guys and generally, a slightly more conservative style amongst other things.