Могу ли я настроить два интерфейса в одной подсети (т0 = 142.10.46.250/24 и т1 142.10.46.251/24)?

Нет. For the routing to work, each interface should be on a different subnet. Однако, if you are only bridging, and not doing IP routing, then you can configure the two interfaces on the same subnet