Philips SBC-HP890 vs SHP895: Same Drivers?

Do these cans have identical drivers or not? In a Russian HP forum I read that the 895 driver design is different as compared to 890's and became quite close to top Senn's (I mean, almost "open" on the outside, a hole in the magnet and a bigger voice coil). Any comments? Too bad I dont have that huge HP890 box anymore. It had a nice picture of the driver design and could be good for comparison. I searched the web all over but couldnt find any.
All in all, 895 IMO is a huge improvement in sound even over my good ol' HD590 (that took $140 outta my wallet). The overall balance is way better than with 590s: no shrill highs, the mids are presented a lot better, bass extention and punch are exeptional. No bump in the midbass.
I also slightly modded my 895s by fixing the cups in a position to exactly fit my head size, so comfort is no longer an issue.
I liked 'em sooo much that I got me another backup pair (in my home town they are $40 only).
TIA