With England already out, the two sides played out a 0-0 draw in Brazil four years ago and the central Americans went on to the quarter-finals of the competition.
However, Ruiz is expecting a very different proposition when the sides meet at Elland Road.
"I think they are much better than they were four years ago," Ruiz said.
"It's going to be a very good game for us. Hopefully we are going to get a good result and good things from that game."
That is a theme that Ruiz is carrying through to the World Cup itself: "It's going to be more difficult this time, I think."
"Our group is very similar. We are going to take Brazil out of that similar group because Brazil is very good.
"It's going to be difficult for us but it's very important to win that first game against Serbia."