Can one tenant sue another tenant for having a different rent amount in a collective lease?

Question Details: There are 5 tenants in a rented house, all of them on a collective lease owing the landlord $4700 every month. If 4 of the tenants have been paying X amount, let's say $1000 for 3 years while 1 of the tenants has been paying Y amount of $700 for 3 years, can the the 4 tenants paying the higher amount successfully sue or create a case against the 1 tenant for paying a lower amount under "fraud" or any other cause in court? After 3 years of paying a higher rent, the 4 tenants suddenly realize one day that they are paying a higher rent and want to sue on order to get the money they were allegedly overcharged back from the previous 3 years. Do the 4 tenants have a strong case to make if they paid the higher amount for 3 years without realizing that they were subsidizing the 5th tenants rent? Thanks

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