Does day-trading inside an RRSP carry the same recharacterization risk as day-trading in a TFSA?

Not identical, but a related risk exists. RRSPs are structured differently from TFSAs and have their own anti-avoidance and "advantage" rules aimed at business-like or abusive activity inside registered accounts, so frequent, business-like trading inside an RRSP isn't risk-free just because the recharacterization framework isn't exactly the same as the TFSA one.

The underlying concern is similar in spirit: registered accounts like RRSPs and TFSAs are meant to shelter genuine investment growth, not function as a tax-free or tax-deferred vehicle for running an active trading business. Because RRSPs come with their own specific rules targeting this kind of activity, rather than simply borrowing the TFSA business-income analysis wholesale, someone trading very actively inside an RRSP should think of it as an analogous risk requiring its own consideration, not assume the RRSP is automatically safer or automatically subject to the exact same test. If your trading pattern inside an RRSP looks like it could be viewed as business-like activity or an "advantage" under these anti-avoidance rules, it's worth having that specific situation reviewed rather than relying on general assumptions carried over from how TFSA trading risk is usually discussed.