3 Data Tags on one boiler

Originally Posted By: bsmith
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http://www.nachi.org/bbsystem/usrimages/D/DSCF00051.JPG ]

The boiler had 3 different manufacturer data plates. All had different model numbers but all had the same serial numbers. Are these possibly for different btu rated units that the manufacturer could place within the same basic cabinet? If so, how do you know which one was installed?