Struggling to understand this index change

OK, I get the surface difference, but beyond that I'm a bit flummoxed... iShares recently changed two of their ETFs, ILCB and ISCB -- read the symbol as Large Cap Blend and Small Cap Blend, where blend includes both Growth and Value. In addition to a technical change in fund name and symbol, they also changed their reference index. For the LargeCap fund, index changed from a Morningstar all-cap index to an MCSI Large/Mid index. 1) What's the impact to me? I own the same number of shares with the

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