Elven "tallness" has been a controversial issue ever since LoTR was published (and possibly before). I always assumed Tolkien's elves, at least the aristocrats, averaged a little taller than the humans of MIddle-Earth, but a surprising number of people concluded that Tolkien's elves were generally a little shorter than humans. Unfortunately, Tolkien neglected to provide any hard numbers. Many individual elves were described as tall, but tall compared to what? Most of the main story is from the perspective of hobbits, to whom Danny DeVito might seem tall.
Tolkien didn't invent the idea of Elves, but other depictions of Elves don't clear things up much. In some stories elves are clearly at least approximately the same size as humans--otherwise changelings wouldn't be very likely to fool anyone, and stories of humans seducing/ getting seduced by or otherwise getting it on with elves become problematic. However, elves overlap with fairies in some traditions, and some fairies, at least, seem to be very small indeed, being able to fit under toadstools and hats and other small things. This is not to mention pop culture depictions of elves doing things like operating major commercial bakeries from the confines of hollow trees.
I am not sure which figures are Caesar and which are Dark Alliance, but the tall brown ones are not just taller, they are also proportioned differently, with extra-long legs, and relatively small torsos and heads, so they seem intentionally extra tall, rather than just scale creeped. They are proportioned a little like Sudanese-born basketball player
Manute Bol, if you remember him.
If you want to use both companies figures, I think you could get away with designating the taller ones as a distinct elven tribe or nation, especially as their armor and gear is quite different looking than their shorter cousins. High Elves of Bol, perhaps?