Most folks (but not all) lose draw length when they switch from compound to a trad bow. There are a number of reasons for this. Swamp Yankee hit on the major one. Compound shooting style is very target oriented -- erect posture, straight head/neck angle, straight, locked bow arm, full extension of the back, often a high wrist grip and a trigger.
Stickbow grips are often straight, which requires a much more low wrist, palm base on the riser grip, which lessens the draw length. Stickbow shooters often tilt their head into the bow string a little, shoot with a slightly bent bow arm and a somewhat more open stance (turned toward the target). All of these lessen the draw length a little. Additionally, the heavier holding weight of stickbows causes most to scrunch up a little, reducing draw length even further. In short, it's not uncommon for folks to lose one to two inches of draw length when they switch from compounds to stick bows. On the other hand, if they retain their compound shooting style and shoot a pistol grip trad bow, the draw length is very likely to stay the same.