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Watts are watts. Did you put out more to hold on to the fast group on your B bike than you would have if you were riding your A bike? If so, technically you got a better workout. How much......hard to say. Likely not enough to move the needle in the grand scheme of things. But may be a nice mental boost once you bring the A bike out.
Now if you have been just doing Z2 miles all winter...and you were with a fast group lighting it up. That is likely why it felt so hard, regardless of what bike you were on.
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