The Amiot 145 was the designation given to a proposed version of the Amiot 144 that was expected to be powered by two Hispano-Suiza 14AA delivering each of them 1100hp of power in order to improve the poor original performance of the Amiot 144.
The Amiot 146 was the designation given to another proposed version of the Amiot 144 expected to be powered by two Gnome et Rhône 18Lars engines delivering each of them 1100hp of power too. As that engine proved to be unsuccessful due to poor power-to-weight ratio, the project was discarded. Also, as we couldn't find any pic of how a Gnome et Rhône 18Lars looked like on an airplane, we left this variant undrawn.
The last one, the Amiot 147 was the designation given to another proposed version of the Amiot 144 expected to be powered by two Hispano-Suiza 12Ydrs/12Yfrs delivering each of them 880hp of power. This last one chose a less powerful but more reliable engine in order to improve the feeble performance of the Amiot 144.
All of them were discarded as the type was already obviously very obsolete by 1938-1939 and there were already better aircraft to centre the production on.
Sources:
1. http://www.historyofwar.org/articles/weapons_amiot_145.html
2. http://www.historyofwar.org/articles/weapons_amiot_146.html
3. http://www.historyofwar.org/articles/weapons_amiot_147.html
4. https://fr.wikipedia.org/wiki/Amiot_143 (translated)
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