Yes but those DVDs are very, very poorly encoded. Macroblocking everywhere to the point that it's not an even trade and you're actually better off with any of the 16:9 sources available (I find FUNi's movie blu-rays generally good quality if you fiddle with the colors to bring out some crushed blacks.)

If Madman ever did R4 DVDs of the movies in 4:3 it might be worth looking into those but I'm not certain, and other than menus and the obligatory PAL conversion they pretty much did straight ports of what they were given so it might not even make a difference.