In comparison to "B to C", "B to B" has a more distant relationship to its customers.
When compared to "B to C", "B to B" has a less personal relationship with its customers.
"B to C" has a less personal relationship with its customers compared to "B to B".
英訳１：in comparison to ...は「…と比較して」という意味のフレーズ。「距離が遠い」は「より遠い関係性を持っている」と考えて、have a more distant relationshipと表すことができます。
英訳２：最初の従属節は、When "B to B" is compared to "B to C"の省略形です。
less personal relationshipは「関係性が薄い」ということ。
英訳３：「B to Bと比べて」を文末に置く場合は、in comparison toではなく、compared to "B to B"とする方が自然です。
ちなみに、「顧客と（サービスを提供する）会社との距離」は distance between the customers and the service providersと言えます。
その他の言い方：
- "B to B" has is not as close to its customers as "B to C" is.
*not as close as ...「…ほど近くない」
- "B to B" doesn't have as close a relationship to its customers as "B to C" does.
アメリカ合衆国 
