Match drilling and enlarging are not the same thing. Match drilling is using the pre-punched hole in one skin/part to make a "matching" hole in another skin/part that you will rivet.
Final drilling is when you have holes in the two skins that already line up - but they are pre-punched a tad small and need to be drilled to the correct size. Final drilling also removes the small burrs made by the punch.
Enlarging is when you have a pre-punched hole that is in the correct place, but is maybe a 3/32" or 1/8" hole and needs to be drilled to 3/16" for a bolt to fit thru. That saves you from having to measure where the hole needs to be - you just have to drill the hole up to size.
Hope that helps... keep working
RV-8 N223TG (reserved)
Finish - arrived 10/7/15
Fuselage - arrived 3/14/14
Wings - arrived 3/7/13
Builder # 83331
VAF Dues gladly paid up till December 2017
"The ultimate responsibility of the pilot is to fulfill the dreams of the countless millions of earthbound ancestors who could only stare skyward and wish." - Unknown