is the current Mazda 3's 2.0 liter engine same as the first generation Mazda 3 engine?

[Tacoma! Yea!]

is the current Mazda 3's 2.0 liter engine same as the first generation Mazda 3's 2.0 liter engine? I know the 2.5 liter engine is all new, but was wondering if the 2.0 liter engine is from the last generations. If so, are there any advantages in efficiency?