I just bought this mystery hoya and am trying to identify it. It looks very similar to Hoya Quinquenervia, but leaves are small and thin. Maybe because a young plant. Any assistance would be appreciated.

It's difficult to tell from your photos, the exact size of the leaves on your plant and you may not be able to get a positive ID until it blooms but it resembles the Hoya related Dischidia ovata

I'll move this over to the Hoya Forum where someone may be able to offer additional suggestions.

Thank you

I have seen plants looking like this advertised on vendor sites as "Dischidia ovata - Watermelon".