The resistance difference is insignifficant. For an AEG you'll never run enough current through it to matter.
If you use the t-connectors from dealextreme make sure you use a hot hot iron. The plastic around the connector is chpeaper and less heat tolerant than deans ultra and because the leads dissapate heat very well. Using a low power iron you'd have to leave the iron on the connector longer than necessary. I'd say 40 Watt min.
... Oh and make sure you tin the leads first if you don't already know. There should be plenty of youtube vids on Deans. Also make sure you put the correct connector on the battery and charger. (exposed leads on a charged battery is no good)