I really think they used a different artist. The normal Trench stadium pennant artwork by the artist we're most familiar with illustrated each ballpark full of fans. These renderings of the Coliseum and Seals Stadium are empty.
But, the batter depicted on these two anomalies was re-used on other Trench pennants, so I have no doubt these are by Trench.
Here's a ca. 1960 photo of a vendor selling pennants outside the Coliseum. You can see the red-variant prominently displayed, along with the more traditional blue one (depicting a full Coliseum), along with other known Trench-made pennants, like that Pirates one. Presumably, this vendor bought all his pennants from the same company ... so, that would be Trench.
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