The Dutch tactician took over at Chelsea earlier this month following the sacking of Luiz Felipe Scolari.
The Blues defeated Aston Villa 1-0 in the Premiership and beat Juventus by the same scoreline in the Champions League in Hiddink’s first two matches at the helm.
"There is a difference in the players," England left-back Cole was quoted as saying by Sky Sports on Friday.
"When a manager goes it is always hard and the players liked him (Scolari), but now it is a fresh start for a lot of players and I think there is a different kind of belief."
Hiddink was widely appreciated by Chelsea fans for playing strike duo Didier Drogba and Nicolas Anelka together.
Anelka was Scolari's preferred choice upfront as Drogba played a peripheral role. The Ivorian striker was reportedly seeking to leave Chelsea as a result of his substitute role.
But under Hiddink, Drogba got a new lease of life and scored the winner in Chelsea's midweek victory over Juventus in the first-leg of the Champions League round of 16.
نرشح لكم
أشرف بن عياد: حمزة عبد الكريم وصل برشلونة وحصل على تصريح العمل
مدرب توتنام: ربما يبدو الأمر غريبا.. ولكننا نسير في الاتجاه الذي أريده
بطل السوبر مع ميلان.. بونافينتورا يعتزل كرة القدم
مباريات اليوم - الزمالك ودربي القناة وريال مدريد وليفربول وقمة سعودية
مؤتمر سلوت: نتوقع من صلاح وجاكبو استغلال الفرص المحققة
جاريث بيل يوضح الفارق بين أنشيلوتي وزيدان
تقرير: قطر تتمسك باستضافة مباراة إسبانيا والأرجنتين












تامر مصطفى لـ في الجول: نخوض مواجهة الزمالك للفوز.. ولدينا حافز الهروب من الهبوط