About the only difference is that our shield looks like a central blob whereas their tree has an offset to their blob.
There are a lot of Aggie designs that we love because they're familiar, but aren't as good as they could be. Our ring, block ATM, mascot, architecture, etc. The ring feels like a Major was given 3 pages of symbolism to fit on a ring, found the ring maker for the academies, and told them to fit as much in as they could.
Sure - it's "timeless," and "military," but the average American wouldn't have a clue what school it signifies if it weren't written on it. Hell - when have you ever seen a shield or eagle anywhere around BCS? And those are the most prominent symbols?
Honestly, A&M would've been a better fit for a longhorn logo. Or adopters if "come and take it." Or even a bonfire stack. Or a riding boot. SOMETHING that's unique to our identity rather than us grafting onto a broader military theme.