Either way...
If it's one gecko (Tremper het Bell) it should not be bred, as it has two albino strains and could muddy up the genetics.
If it's two geckos (Tremper x het Bell) they should not be bred together...again muddying up the genetics and causing problems down the line with future albino breeding.
Keep Trempers with Trempers and Bells with Bells (and Rainwaters with Rainwaters). It's never a good idea to mix albino strains.
As others have said, folks try to avoid crossing albino strains as much as possible so the mixed genes won't be passed on through future generations. If you cross them you will get all normal colored geckos that are het for one or more of the strains.