34 minutes is probably fine. If the connection gets tighter than that, you could ask the FA to help you deplane faster.

Looks like the Flight 46 plane usually goes on to Seattle after landing in Anchorage rather than returning to Portland, so the bad news is you won't be reboarding the exact same plane. But the good news is that Flight 46 has good on time performance, and flight 47 tends to go out a little late.

Based on flightaware, you would have been able to make this connection every day for the last 2 weeks.