No must it look differently?
When Christ said in John 6: “take you all and eat of it, for This is My Body” do you think it looked differently to the apostles?
If the bread that Christ broke and bless and distributed to the apostles didn’t change some way in appearance to those present - did that mean Christ was lying? or that it didn’t actually occur as He said?
Ad Majoram Dei Gloriam
... so they could be certain it had been returned and not substituted.