The quick answer is I dunno. It would probably depend more on your cookies and other links than an IP address. In other words, if you only access this other paypal that is linked to a suspended ebay account from a separate login ID on your computer you might be alright.. because how would ebay know you're accessing this paypal account?
Personally I wouldn't risk it, but if you already have risked it i'd at least remove the banned ebay account email address from your paypal account.
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