Not quite, it is called a deliberate but poor attempt at faking something out of sheer embarrassment and desperation.
As I said, in indo-pak war 100s of fighter plane were brought down. When already many killed birds are available why some one fake it'???
Good try mate, the Chinese derivative didn't enter PAF service until 1988.
The serial number clearly indicates for it to be from IAF MiG-21 batch.....and go through the thread , you will find out it's not the only time Indians tried to capitalise and blundered on their own loss.
It can be MiG19 tail.. I am not expert here.. It just some error , may be some contractor pull wrong tail from warehouse where pakistani plane's wreck was kept..