I'm not sure any of these plants are gesneriads. Most gesneriads aren't terribly succulent, but there are exceptions. The plant on the lower left does bear a resemblance to Columnea hirta "Light Prince," but it's very difficult, if not impossible to ID any Columnea that came without a name label. Once they get bigger and bloom it'll be much easier to ID these plants to at least the genus level, and Columnea sp. have very distinctive blooms. The plant on the lower right bears a slight resemblance to Primulina tamiana as well, but I do not think of the leaves as being succulent. This plant also has very distinctive blooms, so once it does flower it should be relatively easy to determine if it is in face P. tamiana.

Mark

I side with Mark, I do not think they are gesneriads. My thought is some kind of Peperomia.

Thanks indeed, snappyguy and irina. Someone on the houseplant forum mentioned a peperomia for the variegated one. I'll just have to wait and see what they are, ie when they start to blooom, or even grow bigger. I know very little about peperomias, although I do have P. clusifolia somewhere. Are there ever peperomia vines?
Anyway, thanks so much for the help.

I'll bet you a nickle you have Peperomia scandens variegata, aka Cupid Peperomia. Maybe. Try an internet image search.

As for the lower right, I'm not sure. Depending on the size of the pot, the leaves are relatively big. It's POSSIBLE it's a Nematanthus, but it might also be a P. clustifolia.

To really ID them definitively you'll need to wait until they bloom.

Thanks, korina, I'll look up the Peperomia scandens. I have Peperomia clusifolia, so I know it's not that. Otherwise, as you say, I'll just have to wait.

korina, I think you are right. I couldn't find anything to make me certain on Google, but then I thought of looking in old GW posts, and here is the result. Peperomia scandens it is, many thanks indeed.

Here is a link that might be useful: Peperomia scandens variegata

I see this is old but all there are Peperomia orba. The left and back one are variegated forms