So i bought a old model of esp ltd ec-400 about a month ago. a guy sold it to me didnt know what kind of emg is in there. I did some research and found some guitar that exactly the one i was buying on ebay with 81/60 EMGs but i recently came across lot of website and they said ec-400 have 81/81. Now i am pretty confuse, is there anyway to find out which i have?

here some link of it say it 81/60




here some that said 81/81





I play lot of clean stuff so is it worth is to change out the 81 to 60?
Bedroom Set up:

ESP LTD EC-400 with 81/60 EMG
Yamaha SJ550HR, 1980's Strat (rare guitar)
Crate v18
Digitech Bad Monkey
Vintage 30 Speaker
Metal Muff

Saving up for ESP Uruha's Signature Guitar