They play in similar roles so have more similarities than differences. However a few observations:
1. Iqbal tends to pass the ball through teams, mainly with short and medium range passes while Mejbri runs past players particularly in the opponents half
2. Iqbal plays a little deeper than Mejbri but that might be a tactical instruction from the coaches
3. Iqbal has an eye for goal and will drive centrally into the box whereas Mejbri doesn't shoot that much and drifts wider to open the game up for others.
4. Mejbri brings opposition players out of position to him then lays the ball off quite a bit so creates gaps in defence. He plays a longer game than Iqbal.
5. Iqbal played as a 6, 8, 10, 11 last season whereas Mejbri always played as a 10 which suggests Iqbal is more versatile OR...the coaches think Mejbri is better in that position.