The only thing I noticed that the Eco-Classic tickets still give you different amount of points. I think all the way up to 1.5k (or 2k?) per segment in economy (topbonus point!). This is displayed in the booking site in the bottom (to the left for outbound, and to the right for inboud; sum in the middle AFAIR). The variation is quite big. I guess this probably depends on the booking class and is a weak indicator of earning with executive club (very weak ...). I never found out a way to see the booking class, as earning on TB is quite simple, and independent of the class.
Is there a chance to book your ticket with some OTA that displays booking classes? (I know, not so easy to come about)