Very similar - but also clear pattern differences!
Pamela's has 24 ribs extending to the rim. Tipperrary's has 28 ribs.
Pamela's has 5 clear lines of bubbles / dimples extending from each of the central swirls (with some extra dimples filling in areas close to the swirls). Tipperrary's has 7 main lines of bubbles / dimples (also with extras near the swirls).
And different number of dimples / bubbles at the centre, with more in Tipperrary's example.
I wonder if the patterns differ because of different overall sizes of the items?