Originally Posted by Alawyer

No. The passes you earned as a Green member will have the same conditions for redemption even after you have been upgraded to GO. IE you can only redeem these Green passes for a travel companion who is travelling on the same itinerary.

If you look in the mid-Tier benefit summary, the pass should be tagged [Green Member].

Yes agreed with gpia. You can select the segment for redemption upon check-in.

In practice though, once you are GO, the check in counter will not print out the redeemed pass for your companion because they assume you will invite them in with your lounge pass.