Same lower third looks different on two sequences with the same colour space

Hey all, 

I'm having an issue and I'm stumped as to how to solve it. I made a lower third in After Effects, with a colour gradient and opacity gradient as its background. On a video I edited only yesterday, the lower third appeared correctly in Premiere, like so:

However when using the exact same graphic (exact same file that is, not a re-export) on a different Premiere Pro project today, it appears with the colour looking too dark, and the opacity also looks a bit off to my eye:

The colour space on each sequence is the same (Rec. 709), both instances of the lower third are at 100% opacity, and both have the same blend modes on (normal), so I'm not sure what else to try in order to fix it. Any help would be greatly appreciated, thank you!