Different models of electronic scales, as long as the voltage is the same, you can share a charger to charge the electronic scale, generally speaking, AC power line as long as the connector can be inserted there is no problem, if it is with an adapter, you can view its input\/output mark, the input is generally AC 220V or AC 100-240V, The output DC 9V 1A(provided that the battery used in the electronic scale is DC 6V 4A\/H) is no problem, it is best to confirm the mark on the electronic scale to avoid overcharging danger.
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Generally, no. Electronic scales using 6V battery chargers are best to use a dedicated charger, and 6.5V is also fine.
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Some electronic scales that use a 9V charger can also use a 12V one, because they are universal. Otherwise it is easy to burn the electronic scale with too much voltage.
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For motor safety, it is best not to use 9V power supply. As long as the power supply is 6V output, the output current can reach 800ma or more, and the motor can work safely.
Most of the chargers of electronic scales can be universal. However, due to different manufacturers, some individual can not be universal.