O,
Monitoring intensity becomes a challenge in group rides, but group rides are such a great way to stay motivated that it’s worth the accommodation.
Yes, for sure you can take similar intervals from Tuesdays’ Solo Ride 1 and insert them into the longer Saturday Group Ride 2. Solo Ride 1 then becomes a Zone 2 effort.
While the order and frequency we put in the plans is “ideal” there are multipole ways to modify the plans to maintain the 80/20 ratios, and this is one of them.
David