Are the type 38 and 99 receivers the same?

[Salt Flat]

The locking lugs are of different lengths as well as the corresponding shoulders in the receivers. The Type 38 bolt has the longer lugs so will not go into a T99 receiver. The T99 bolt will go into a Type38 receiver if the extractor is removed. The extractor is flat on the T99 which won't allow the bolt with extractor to fit into the T38. Also the locking lugs wouldn't be in contact with the receiver shoulder which could be disastrous if fired. (not sure if it could actually fire like this) but the bottom line is the T38 and T99 bolts do not interchange.
Salt Flat