The cap was first introduced for the 1994 season and was initially $34.6 million. Both the cap and the floor are adjusted annually based on the league's revenues, and they have increased each year. In 2009, the final capped year under that agreement, the cap was $128 million per team, while the floor was 87.6% of the cap. Using the formula provided in the league's collective bargaining agreement, the floor in 2009 was $112.1 million. Under the NFL's agreement with the NFLPA, the effects on the salary cap of guaranteed payments (such as signing bonuses) are, with a few rare exceptions, prorated evenly over the term of the contract.

Can we conclude that do all nfl teams have the same salary cap?
yes