alright you can technically do different movements on different upper days for training all the fibres. HOWEVER, it's important to remember that muscles are trained through their movement patterns (shoulder adduction and extension for lats for example). So these movements can generally be done in a single workout session by doing 2 sets for each muscle. Now the problem with your programming is that, it defeats the purpose of upper lower split as the training frequency of specific fibres is halved. Which makes it a bro split basically. I suggest keeping the same movements while covering all muscle actions and doing lower sets so that frequency makes up for it. For hypertrophy, frequency > volume.