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Yes, they are two different effects. One enlarges you, one treats the weapon as one size larger. There is no overlap for stacking to be an issue.
What about the new Enchantment for weapons called Growing.
This comes from the Pathfinder Companion Guide - Melee Tactics Toolbox Player
GROWING
Price +1 bonus; Slot none; CL 6th; Weight —; Aura moderate transmutation
DESCRIPTION
This special ability can be placed only on melee weapons.
Once per day, a growing weapon is able to grow by one size category, dealing damage as appropriate for its new size and allowing its wielder to affect creatures one size larger than normal with combat maneuvers limited by size. The wielder is able to use the weapon normally without penalty despite its increased size. The weapon remains at its increased size for 10 minutes.
CONSTRUCTION REQUIREMENTS
Cost +1 bonus; Feats Craft Magic Arms and Armor; Spells enlarge person

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Under "Construction Requirements" it lists Enlarge Person.
With the Impact enchantment, Lead Blades was also a Construction Requirement, and the FAQ notes that as one reason why Impact and Lead Blades don't stack.
So, for the same reason, I would believe that Growing and Enlarge Person would not stack.
But, Impact and Enlarge Person (or Impact and Growing) should work together. They are different effects.

mplindustries |
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With the recent FAQ, you can stack a single effective size change with a single actual size change.
Leadblades, Impact, Improved Natural Attack, etc. are effective size changes. Enlarge Person, Growing, Animal Growth, etc. are actual size changes. You get one from one group and one from the other.
Impact stacks with Enlarge Person, but it won't stack with Leadblades.

Claxon |

You're link point to the damage change progression FAQ, but I found it right underneath.
Size increases and effective size increases: How does damage work if I have various effects that change my actual size, my effective size, and my damage dice?
As per the rules on size changes, size changes do not stack, so if you have multiple size changing effects (for instance an effect that increases your size by one step and another that increases your size by two steps), only the largest applies. The same is true of effective size increases (which includes “deal damage as if they were one size category larger than they actually are,” “your damage die type increases by one step,” and similar language). They don’t stack with each other, just take the biggest one. However, you can have one of each and they do work together (for example, enlarge person increasing your actual size to Large and a bashing shield increasing your shield’s effective size by two steps, for a total of 2d6 damage).
I knew about the first, but not the second.
So now we know conclusively that you can't stack something like bashing and spike on a shield.