Yep, it’s smaller.
New specifics about the recently-revealed Duelist Pack have surfaced.
Specifically, it will have 46 cards (10 less than the previous Legend Duelist DPs), divided as follows:
1 Holographic Rare
5 Ultra Rares
7 Super Rares
9 Rares (4 less)
24 Commons (6 less)
All Ultra Rares and Super Rares will now also have Secret Rare variants, not unlike core boosters.