No, it's not a reformulation of tirzepatide. Orforglipron is a small molecule with a molecular mass of 883 g/mol and tirzepatide is a large molecule peptide six tims larger, with a molecular mass of 4813 g/mol.

The Wikipedia pages are decent -- the picture makes it fairly obvious how much smaller orforglipron is than tirzepatide even if you don't know how to read chemical structures; just count atoms!

https://en.wikipedia.org/wiki/Orforglipron

https://en.wikipedia.org/wiki/Tirzepatide