Without knowing your skill & knowledge level (or personality) personally, it's difficult to say.
While looking at it from a wing loading perspective, admittedly you're not changing too much. But from a wing perspective, you are jumping from a 7-cell rectangular to a 9-cell fully elliptical. Conventional wisdom would suggest trying a Sabre2 150, then Katana 150 to work your way through the various flight characteristics of the wings prior to downsizing to a Katana 135.
Admittedly, I prefer to progress faster than conventional wisdom as well, this is where I mention your personality & knowledge level. Are you the type of person to take some canopy courses and work with a canopy coach to learn the flight dynamics of a wing, before deciding "hell I do 90's on a Storm 150, I'm sure I can stab the Katana 135 out if need be"? The Storm 150 to KA135 is not so unmanageable a jump that I wouldn't expect someone who takes it slow and conservatively learns the new wing, couldn't do it safely. But self awareness of our own limitations is often a rare trait in skydivers.
Taking bigger steps in your progression requires a self awareness of your own limitations and discipline to not seriously hurt yourself. It also requires honestly learning about the flight dynamics of a wing, understanding the changes from the wings you are used to, and lots of practice up high. Don't rush it and "femur it in"
With that in mind; ideally you could demo or borrow a friends Sabre 2 150 (they are pretty common), and demo a Katana 150 via PD. I'd highly suggest at the very least demo a Katana 150 first, demos are pretty damn cheap for getting 2 weeks to fly the hell out of a wing! Even if you Demoed both it would only cost you $190 in demo fees to work your way through over a couple months. Spend some time on the demos doing high pulls and get as much time in the saddle as you can! Enjoy them! :-)
(Demo fees << health insurance deductibles for biffing it in!)
Also, I loved my Katana 120 and put 100+ jumps on it. An amazing wing to progress on, and sadly gets an undeserved bad rap for being too steep in full glide. But as a bonus for you, it makes buying used ones much cheaper! When you get under one, explore the flight range, mine got me back from some very long spots riding the rears, it's not as bad as some may say! :-)