Both parties are opposed to the 'bedroom tax'.
However, apart from the indy referendum, it is currently the one issue they are having the biggest rows about.
At a council level each is opposing motions by the other for non-eviction policies and for extra cash to be allocated to help affected tenants.
While Labour at Holyrood has just asked the SNP Scottish Government to make extra cash available, Labour in Glasgow City Council has rejected a call from the SNP to top up the Discretionary Housing Fund.
Labour estimates that £50 million would cover the shortfall, but that figure is likely to rise as time goes on and the problems worsen.
Labour says the answer is for the Scottish Government to pay the cash to ensure tenants aren't evicted and councils and housing associations are not left to shoulder the massive rent arrears.
The SNP says it is already making cash available through the Scottish Welfare Fund and, if Scotland votes Yes to independence they will scrap the tax .
That means a wait till at least 2016, leaving the party open to Labour accusations of not doing enough to help people is crisis now.
Labour also has a problem. The £50m would be needed every year and the UK party is yet to state it will scrap the tax should it win at Westminster in 2015.
Also, a non-eviction for 'bedroom tax' arrears policy will be tough to implement, and it will be hard to prove which arrears are down to the tax and which are a result of other budgeting priorities.
So we have a policy from the UK Coalition Government which is having a serious impact on many people's lives, some who are already in financial difficulty and the benefit cut is pushing them, in some cases, to the point of suicide.
And in Scotland it has led to a tribal battle, contrived to prove to voters that the other side is not willing to help the poorest people.
There are many problems with the Scottish response to the 'bedroom tax', but what is clear amid the mud slinging is that both SNP and Scottish Labour oppose it.
By uniting on this issue and rising above the referendum campaign the parties, with Cosla, could devise a serious Scottish response.
Instead, George Osborne has easily managed to set them at each other's throats.
He must be laughing his little head off.