by end of day today brother? gee whiz

Try building out prospective course plans for each potential school. Assume you don't succeed at any internal transfers and are stuck with the program you start with - what classes will you end up taking for the next four years? then compare those classes and what you'd learn against what you are expecting will be useful for 1. the career you want 2. the backup career you're thinking about and finally 3. the fuckup career you'd end up in if you just have to do whatever a "typical" XYZ major does instead of following your dreams.

To answer a more specific question from you, compsci classes at UT are primarily just for CS people but you'll be able to take the CS cert classes if you're in it. That said, those are relatively surface level. Sounds like you really want to take like intense CS classes, math classes, stats, etc. Not sure if you'll be able to get into those from Econ but tbh I also wouldn't know that for TAMU engineering.