There is a difference in the 88 & 100 clips.
They both should fit and work in the 88, not really sure.
I have a model 100 with three clips.
Two are model 100s and one is a model 88.
All three fit in the 100 and work but the 88 clip lacks the hump or stop on the follower that engages the bolt to keep it open after the last round has been fired.
If you put the two clips side by side in the up position you will see the difference in the two followers.
I am not sure if the stop on the follower of the 100 clip would interfer with the closing of the bolt on a 88.
See pics below.
I hope this helps.
Sorry about the poor pics.
The one on the left is the 88 and the one on the right is the 100
LONGTOM