Well, you've never seen them photographed together, right?
The Phadampa Center website (a group based in California) claims that Padampa Sangye *was* Bodhidharma, that is, the person known as Bodhidharma was Dampa Jakar while teaching in China. (Evidently, he did teach in China.)
I find this claim unconvincing because the chronology seems off... Bodhidharma was appealed to as an authority in China at least a century before Padampa Sangye was said to have visited China.
This is clearly a Tibetan sectarian polemical hagiographical statement. It is not to be taken seriously. Just as the person of Bodhidharma was wildly inflated by the Chinese, so too has the person of Padampa been wildly inflated by Tibetans.