The Spaniard does not think Swansea will be weakened by their managerial change but believes the Partenopei are better now than they were at the tail-end of 2012
The Partenopei were eliminated from Europe's elite competition before Christmas as a result of their inferior head-to-head record, with Borussia Dortmund and Arsenal progressing at their expense.
But Benitez - who lifted the trophy with Chelsea last year - says his charges will treat their upcoming Europa League clash as though they were still in Europe's premier tournament.
"Swansea are a good team, we have to play with the same character shown in the Champions League," Benitez told reporters.
"The message is that we play every game to win, in a game like this - over two legs - it will be important to score away from home.
"We are a more solid and balanced team than last year, thanks to our efforts and signings in January."
Benitez thinks that Swansea's recent managerial change - Michael Laudrup was sacked and Garry Monk placed in temporary charge - will not weaken them and revealed striker Gonzalo Higuain and defender Raul Albiol are doubts to play in midweek.
"Swansea have changed coaches but a Premier League club is never an easy challenge," the Spaniard added.
"We have to evaluate in training whether Higuain will be fit, while Albiol is not 100 per cent."