This doesn't answer your question... but I still use old versions...
Not sure between the watch 6 and watch 5 in terms of their induction charge wattage... but I still use older chargers from a watch 3 with my watch5 Pro... with no issues.
If anything, the older charger will likely be slightly less power wattage as it is USB-A rather than USB-C which is generally capable of a higher output.
I keep my old one at work... so have more availability.
I also have the trio charging station and used for a couple years... this charges the watch5pro along with phone / buds all fine.
Smiley
- Smiley
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SAMSUNG S23 ULTRA 512GB SM-S918B/DS
Samsung One UI 5.1 / Android 13
Samsung Galaxy Watch 5 Pro SM-R920 in Grey Titanium
Samsung Galaxy Buds2 Pro SM-R510 in Graphite