[stella] X or Y ?

Subject: [stella] X or Y ?
From: happy_dude@xxxxxxxxxxxxx
Date: Thu, 15 Apr 2004 20:26:36 +1000
I had a lot of code like this in Master Mind deluxe

   ldy #4
load_1
    lda r1peg1,y
    sta Dpeg1,y
    dey
    bpl load_1

I changed it all to this and saved a lot of rom

   ldx #4
load_1
    lda r1peg1,x
    sta Dpeg1,x
    dex
    bpl load_1

Why? 
I'v read through the 6502 documentation and can't see any rason why.
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