They do not look overweight to me. The all white guy looks good and the yellowish/white one looks okay to a little thin even.
However, I am not a BP expert and I'll let others chime in.
This is Shayna, my (almost) 8 year old Albino Spider BP. She seems healthy to me and looks hefty compared to the BP's you showed.
She fasts every winter and eats small rats every two weeks the rest of the year.
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