I think it's cool that you've taken the time to do this!
Though I do think it's pointless to point out that Overture 1928 and other songs from the album have similar or same things. After all presenting the different themes of the album is what an overture is for. That's literally what an overture is. A presentation of what's to come.
And starting from around 1:50 the riffs are not the same
per se, but pretty close
These are just some thoughts.
What you've done is awesome. Thanks!! You could do more of these, dig out the influences and similarities behind DT songs! You'd get a ton of YouTube hits!