The Spaniard spent four years as manager of the Catalan giants - a club he spent over 17 with as a player. He won three La Liga titles and two Champions League's during his time in charge.
City won the League Cup - their first trophy under Guardiola - last Sunday and are almost guaranteed to win the Premier League title. They are also likely to book their place in the Champions League quarter-finals.
But Guardiola is adamant City need silverware to solidify greatness.
"No. It's completely different players, the players in the past won a lot," replied Guardiola when asked if his City team could compare with Barcelona.
"We are nil, most of us. We are new here. Now we can say we have won one title but it is not comparing, so no.
"It's not good for us to be compared with that team. That team has dominated for the last decade, 15 or 20 years with different managers and different players.
"Every season, they have won a lot of things and we have won just the first title. To join this kind of team, you have to be there for a long time - many years - but we've won just one title, that's all."