Sizing

Hello I am looking at buying a boardman road bike, however I need advice on sizing. At the moment I have a large boardman fs comp, however I am only 5"8/9 therefore the sizing guides say I should have a medium road bike!
Do you think this is the case, my large boardman mountain bike is perfect for me?
Thanks
P.S I am looking at a boardman comp road bike, any good? Are there any others good at a similar prices?
Do you think this is the case, my large boardman mountain bike is perfect for me?
Thanks
P.S I am looking at a boardman comp road bike, any good? Are there any others good at a similar prices?
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Instead of opening another thread, I am looking at riding on the road no massive hills but a few. I have found a triathalon bike which is fantastic but not sure what the difference is between a road and tri bike?