As far as I know, there's no way to merge two emails and combine historical performance data for both emails through HubSpot. You would need to export engagement data and manually merge it outside of HubSpot if you are working with two separate emails.
To your point, you could update the original email to preserve all engagement data in one place. Just keep in mind that you may not be tracking 1:1 data if you've made significant updates (like adding/removing links, CTA buttons, and images). You'd want to make a clear note somewhere indicating that date that you updated the email (like an annotation in Google Analytics).
That said, couldn't it be valuable to have separate email analytics in those separate emails to compare performance? Depending on the updates you're making in the new email, it could be helpful to see if the original or new email performs better.
If you have both emails added as assets in the same campaign, you could also check out and aggregate email performance that way. The campaign would allow you to track the original email (that would be no longer in use) alongside the new email (that is in use).
As far as I know, there's no way to merge two emails and combine historical performance data for both emails through HubSpot. You would need to export engagement data and manually merge it outside of HubSpot if you are working with two separate emails.
To your point, you could update the original email to preserve all engagement data in one place. Just keep in mind that you may not be tracking 1:1 data if you've made significant updates (like adding/removing links, CTA buttons, and images). You'd want to make a clear note somewhere indicating that date that you updated the email (like an annotation in Google Analytics).
That said, couldn't it be valuable to have separate email analytics in those separate emails to compare performance? Depending on the updates you're making in the new email, it could be helpful to see if the original or new email performs better.
If you have both emails added as assets in the same campaign, you could also check out and aggregate email performance that way. The campaign would allow you to track the original email (that would be no longer in use) alongside the new email (that is in use).