A friend of mine at work is rebuilding a 169, and he says the two valves are the same size on his K341, and this is also supported by the parts lookup; the valve part numbers are different, but the seats are both the same part number. I had a 1650 but never had the head off of it, so I wasn't sure what it was supposed to have. I think some of the 14 hp engines also have the larger exhaust valve.
Anyway...since they are aftermarket and presumably weren't marked intake or exhaust, they are probably interchangeable. However, you get what you pay for, and they probably aren't as good as the OEM valves. Your comment about the stem diameter supports my overall distrust of aftermarket parts. Since your aftermarket valves are about 2 thou undersize, you will probably lose oil through the valve guides, particularly if you did not replace the valve guides. Do the valves wobble in the guides? If so, you will have problems sooner or later, if not, you may not. Have you measured the stems of the valves you removed?
If it were mine and I were planning to keep (and use) it, I would have bought OEM parts. I have in the past used aftermarket parts in machines I knew I wouldn't keep, but for my 'keeper' stuff I try to stick with OEM parts, unless it's a trailer queen.
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