These days 4 Line bars designs are mainly between the 2 types illustrated above.
The most common type is the combination of High ''V'' and dual front line flagging, such as with Core kites.
Mixing with a different bar that has a lower ''V'' (such as Ozone) is going to ''work'' as well but will give poorer flying performance especially on larger kites. For best results it's always better to match the height of the ''V'' as well as the type of safety system (single or dual front lines). If you match those you'll definitely have no difference at all with flying performance or safety systems performance.
Also, some kites have different Larks head / pig tail configurations so sometimes you'll have to switch the connectors to make it fit.