First, there is codex 1147 which contains Book 3 of Lombard’s Sentences commentary. Visit http://mirador.scta.info and search for “1147”, “Lombard” or “Philadelphia” and you’ll be sure to find it.
Now you can see this UPenn manuscript side by side a witness of the same text in the BnF, ms. lat. 15705.
Just paste these manifest links into any IIIF viewer and view the texts:
I also added a manifest for an anonymous fragment of a Sentences commentary, UPenn codex 727, IIIF manifest:
On my count, these are the 38 and 39th witnesses in the viewer. Woohoo!!!