This relates both to doctrine and liturgical practice. Some Anglican parishes offer worship which is barely recognisable as 'Anglican'. At times some evangelical Anglicans have felt that the Old Catholic Church was too un-reformed. In Flanders many RC religious tune in to the 'EO', the Dutch Evangelical Free Church Broadcasting Corporation. There are so many permutations of doctrinal, devotional, spiritual and liturgical preferences, that there is plenty opportunity to concentrate on each other's strengths and to encourage those.
True catholicity includes that all are welcome and can find their place.
Idiosyncratic extremes are to be shunned, as is a grey common ground approach. Both churches have distinct musical traditions, with partial overlap. The Old Catholic Church has recently published a new and comprehensive hymnal. The Annual Anglican Choir Festival could do with Old Catholic choirs participating. The Anglican Church imposes a discipline on its clergy to pray the offices every day.