We are definitely not selling "Our" top tier system or weapons of Block-III but on other hand, I don't think Western Tech will be allowed to Chinese to be installed for sell to Egypt. Egypt is buying from China. However, if the purchase is being made through Pakistan then we can think about Western Tech of Egyptian choice to be provided but still a long shot.I would imagine it would be all to easy for the Israelis to get detailed info on the Block 3 if Egypt does infact purchase them.
i.e. compromised intelligence situation leading to decimation of Egyptian air force in 6 day war.
It may be wise to not clear for export all systems and capabilities Pakistani Block 3 field.
At least in terms of avionics.
Field performance of course will be revealed.